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## org.jgraph.graph
Class ParentMap

    java.lang.Object
      |
      +--org.jgraph.graph.ParentMap

All Implemented Interfaces:
  Serializable

public class ParentMap
extends Object
implements Serializable

An object that describes relations between childs and parents.

See Also:
  Serialized Form

Nested Class Summary
`class` | `ParentMap.Entry` Object that represents the relation between a child an a parent.

Field Summary
`protected Set` | `changedNodes` Set of changed changedNodes for the parent map.
`protected Map` | `childCount` Maps parents to integers with the future number of childs.
`protected ArrayList` | `entries` Contents of the parent map.

Constructor Summary
`ParentMap()` Constructs a `ParentMap` object.

Method Summary
`void` | `addEntry(Object child, Object parent)` Add a new entry for this child, parent pair to the parent map.
`ParentMap` | `clone(Map map)` Creates a new parent map based on this parent map, where the child and parents are mapped using `map`.
`static ParentMap` | `create(GraphModel m, Object[] c, boolean remove, boolean strict)` Returns a parent map that represents the insertion or removal of `cells` in `model` based on `remove`.
`Iterator` | `entries()` Returns an `Iterator` for the entries in the map.
`Set` | `getChangedNodes()` Returns a `Set` for the nodes, childs and parents, in this parent map.
`int` | `size()` Returns the number of entries.
`String` | `toString()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### entries

    protected ArrayList entries

  Contents of the parent map.

### changedNodes

    protected Set changedNodes

  Set of changed changedNodes for the parent map. Includes childs and parents.

### childCount

    protected Map childCount

  Maps parents to integers with the future number of childs.

Constructor Detail

### ParentMap

    public ParentMap()

  Constructs a `ParentMap` object.

Method Detail

### create

    public static ParentMap create(GraphModel m,
                                   Object[] c,
                                   boolean remove,
                                   boolean strict)

  Returns a parent map that represents the insertion or removal of `cells` in `model` based on `remove`. Unselected childs of selected nodes are moved to the first unselected parent of that node.

  Note: Consequently, cells "move up" one level when their parent is removed. Note: Strict can be used to indicate if only cells fromt the passed-in cell array are allowed parents. This is only used if remove is not true.

### addEntry

    public void addEntry(Object child,
                         Object parent)

  Add a new entry for this child, parent pair to the parent map. The child and parent are added to the set of changed nodes. Note: The previous parent is changed on execution of this parent map and must be added by the GraphModel and reflected by the GraphChange.getChanged method. TODO: In general, the GraphModel should be in charge of computing the set of changed cells.

### size

    public int size()

  Returns the number of entries.

### entries

    public Iterator entries()

  Returns an `Iterator` for the entries in the map.

### getChangedNodes

    public Set getChangedNodes()

  Returns a `Set` for the nodes, childs and parents, in this parent map.

### clone

    public ParentMap clone(Map map)

  Creates a new parent map based on this parent map, where the child and parents are mapped using `map`. If one the cells is not in `map`, then the original cell is used instead.

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

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Copyright (C) 2003-2004 Gaudenz Alder. All rights reserved.